Doing convlolution between a kernel and an image, see wiki.
|tSrc||Tensor||The source image to be convolved.|
|tKernel||Tensor||Kernel body, tensor with shape [n, m, 4],|
where alpha component of each pixel is kernel cell value.
|factor?||number||a scaling quantity that is multiplied by the result|
|bias?||number||is added on after the factor has been accounted for|